// JavaScript Document

//-------------------------logIn页面中验证码------------------------------------// 
var code ;
//产生验证码
function createCode(){    
	code = "";   
	var codeLength = 6;//验证码的长度   
	var changeCode = document.getElementById("changeCode");   
	//所有候选组成验证码的字符，当然也可以用中文的   
	var selectChar = new Array(0,1,2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z');
	   
	for(var i = 0; i < codeLength; i++)   {   
		var charIndex = Math.floor(Math.random()*36);   
		code += selectChar[charIndex];   
	}   
	if(changeCode){   
		changeCode.value = code;   
	}   
}   
//检验验证码
function validate(){   
	var inputCode = document.getElementById("checkCode");   
	if(inputCode.value.length <= 0 ){   
	   alert("请输入验证码！");   
	}
	else if(inputCode.value != code ){   
	  alert("验证码输入错误！");
	  createCode();//刷新验证码
	  inputCode.focus();   
	}
}
//--------------------------index页面中验证码------------------------------------// 
